Irish singer-songwriter Sinéad O`Connor, known for hits like `Nothing Compares 2 U` and her outspoken dedication to various social issues, has died. She was 56. The gifted singer became a superstar in her mid-20s but was known as much for her private struggles and provocative actions as for her fierce and expressive music.

 "It is with great sadness that we announce the passing of our beloved Sinéad," her family confirmed in a statement to the BBC and RTE. "Her family and friends are devastated and have requested privacy at this very difficult time."